compound angles

[justoneder]

I know this involves trigonometry but I was hoping for a chart to guide me. When I face a work piece, I want to close in on a precise dimention. I lock the apron and turn the compound rest about 30 degrees and move the compound dial a few thousands (1 to 5), and make a pass with the cross feed. I would like to know the relationship between the angle of the compound in degrees, to the distance moved longitudinally by the tool post. Or:
if the compound rest is set at 30 degrees to the cross feed, and is moved .001" how far does the compound movie longitudinally? I tried to use Trig but, no soap. Rr

 

[Dr.Fiero]

I just saw a mr.pete video on this!

At 30* there's a 2:1 ratio.

He mentioned doing at a 10:1 ratio, but the degrees escape me. Want to say 84?

 

[Dr.Fiero]

Found it....
http://youtu.be/n_dZe3K0a5M

 

[justoneder]

thanks Dr Fiero for the fast response. I searched mr pete and came up with nothing but porn videos. Must be another pete. Rr

 

[justoneder]

You did it Dr Fiero, That is a great video. I really appreciate it. Thanks, Rr

 

[Tony Wells]

Some of that math that we all thought we'd never need, eh? You could use one of the many online triangle solvers if you want.

Here's one:

http://www.mathportal.org/calculators/plane-geometry-calculators/right-triangle-calculator.php

 

[justoneder]

Thanks Tony, thank you all for the advice. That Tubalcain guy is a great teacher. Rr

 

[jocat54]

This post has lots of good info http://www.hobby-machinist.com/show...g-amp-Checking-Compound-Angles?highlight=sine